[vs*] Allow to have per-file `cdialect`/`cppdialect`.

[Jarod42]

What does this PR do?

Handle cdialect/cppdialect in per-file configuration for visual studio generators

How does this PR change Premake's behavior?

Only affect visual studio generators

Anything else we should know?

cppdialect tested with dedicated project https://github.com/Jarod42/premake-sample-projects/actions/runs/8377114412

Did you check all the boxes?

• [x] Focus on a single fix or feature; remove any unrelated formatting or code changes
• [x] Add unit tests showing fix or feature works; all tests pass
• [ ] Mention any related issues (put closes #XXXX in comment to auto-close issue when PR is merged)
• [x] Follow our coding conventions
• [x] Minimize the number of commits
• [ ] Align documentation to your changes